There is no reason we'd demote Casas. His splits are pretty even, so far this year, but he's been know to struggle vs LHPs, so there might be times he sits vs a lefty, but I doubt we look to straight platoon him with Turner (who DHs vs RHPs.)
The Pedey example is famous, but there may be more examples like Dalbec, who was given a long look and came through, at the end of 2021, but then... poof!
(BTW, I've not given up on Dalbec, just yet, either, but it looks like he may get a chance with another team, not us.